New ask Hacker News story: Ask HN: Do 'economic drainage basins' exist?

Ask HN: Do 'economic drainage basins' exist?
4 by jka | 6 comments on Hacker News.
My understanding of geological drainage basins is that if a drop of rain lands at a specific location of the earth's surface, it's generally possible to determine where that droplet will eventually pool with other water from the same area. Does a similar (perhaps probabilistic) concept exist within finance/economics?

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